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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40096da4bfe8070ffc2bc40c6f10a650013cc238fbe3f54c47c648f4575699c9' 
  AND token = 'Til5SmG6+J2V9KxQlHVt5iAPTe+EVBzXRfR1SCL36X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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