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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e755c194f00b9d3992afce5c6ed8e1386b14d6ac6e786f414e50da7821b0ff' 
  AND token = 'VQsYrnP4oDJm79ErywW/DtJWivhBzahXxb3m1xEDXaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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