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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff06f2860c1f5f9d853a516fd4ddf982b4f50b7bd4f8ae93ba4c66b79b472d91' 
  AND token = 'JnJLELu1i31LQ6/ivSPQ77NdSc90WYIR4dx/NIKwu1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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