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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63120ed028f3578bfc1f9db6e95bcfc0e7e852e35d51c463824cd9d6d6cb8c14' 
  AND token = 'CYSGcESNd0mSrtEkNi6h6X5/gRiQ4zInPJ4LVGIaECw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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