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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25517ddbf2d58d2ff27b40805302eb6d1fd584ed3eabcf4107bd8a0815da90f9' 
  AND token = 'aDodmHe/njEZtMjOEwz0cJZnNBiXP72IB6FzyjP47q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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