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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f5d6359cc52f182e7fb0a22fb954598d06088b67310957502c001816a75f2e' 
  AND token = 'QCeY6tdZ9ukDnk7DtJJX/PMhfY9plqYjFP51ZYlW5LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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