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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfee748a85939c822ac29a99e6cdf5ac12ef47c2251b1cac3647f8f0f30eb241' 
  AND token = 'PiZ9zXsqL5bUdV1MMM1Syz6Y+bYhr4vgi/m7xafe2yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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