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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925111c94edf3968ee1a6ad39a098f5c2e108dfa9483cf44493eceb3e15bf6f3' 
  AND token = 'FSN8Dm4ZF3q40fXaZ6mcgsAYrTgh5uzVsQozUmz70g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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