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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82862bbf983b33c0484ee28cdbaa701fa1082ec6819c52e2859083913acb887e' 
  AND token = 'Tw3jJptmz+qgW6pG6oDFvCyqN+yY0X0sRNLw/uypf3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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