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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0f1071f1ad86ab6049af4efb537cb88b9aef055da9cd6b1d4a2cca0fa166a5' 
  AND token = 'Hoxa5DvHgvAS5ra5iz8v5syqu+PEKET+OG3s70b7d38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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