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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190ab1aa80b6667ef0b3198b932d6a65ae4268604740f5249ecb980f2cdb58f0' 
  AND token = 'Y+yAdyxVYEFmCdu230XbuHw+k2o/vohjPr83QRQG8l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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