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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db9d19203df968c3fa85dd557ea70d490ae209813314157a133170139ae2278' 
  AND token = 'baOOd0SjL2sUt/Hd567ZWC93oW1k+xrzxIB5fl2RUAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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