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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57480017e42b83acd633d3756b53797ace443e8a6fcfda8f6e62896138ca08e' 
  AND token = 'fA1+bbMD4M2LWK4Fr+Yo+WblKWPAeDTEosjYeKtAygQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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