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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665535e569fa2dc0f4dbb911bff57fad710a8f2315251838d61d678205f40a98' 
  AND token = '6+a0QE9srDkViOuPnFrd0wzmZVoJTbJQO2qU2gJqlts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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