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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da903d70268d19d568cee76f7cb380de3a21cc37a1935fa44ed422b7230ef9bb' 
  AND token = 'iYATKOjdpCz4pWn7kcw7sWJTpdsgbYSt9kD25FCx1HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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