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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10690f3fcc533863037fe993ba54ca813da788f8a6b25a12952d52e9f405ffcd' 
  AND token = 'qc2K/7o2n3edNmEDMLpkv8Ea4rjktZty7WwuJ9jxeOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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