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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b3cdac175aca6e4ad6a5d8942f55b3447a3d271a4c9a2d94cfeb3849227853' 
  AND token = 'aofqBeeQmsBgT5r9sSHvxLTvAT9IxhBQMDmcJfCizho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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