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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a03b4d159ab3a94e8697aaa553bbf3bff879ca878c0a22a25cd40b1d45559a' 
  AND token = 'diiIzFeORSYvPweMm1Zn5/codMQn3Sb7BE7zURgTAec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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