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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e13a430bce691f6f7b10364917f1f5deaa679a08cae8f7e07875330ebd48b0' 
  AND token = 'sbJWbDDdSA/CrGUjj4Uy/NKjUOv4G9x9Bry9O9nE1Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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