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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea3634e6766454b951eaa397deaedf7126a359ec4c1c41cf971e85de5a62696' 
  AND token = 'z/o/xBeJAkGRreR18J7m6ElmKVwHJ5YJuZVVSbAilMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}