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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e87b5488dfb13ae2033821724f3112e78690e12cfa5d2cb4c3897aff9aa6051' 
  AND token = 'qITsDqWz9sD9kbKUbtzDs15FDSEHklIVDK2NhvObGzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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