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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec436b2bc59b10f2de56a0bc2e7e1b2a6f1f675a03c10c28c9aa3eca97ffd64' 
  AND token = 'Whuwr5k540FPgvAX/EJq9JFl1cG1CiI3n7L11CVb+Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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