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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd539f08745f1a989fd83daf55125af2e2ccbce3d112523a77f0388763e52c89' 
  AND token = 'klAaom6C3JLzT7qQB3K3oHu3vAa0Dw2y4ApiObq2N2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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