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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0907c9b8ba2c47eb31357a3c4d1f5006c76d15406295a06d7e53b048a3b6fde' 
  AND token = 'mkut4lTlHHYuqKvROgSxHAbojqPWRAW2Il4Hzjv/6T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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