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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a8bf580846cf7aac655feae906f15e17bd69f4dc90b9acb7bf440b00ed260b' 
  AND token = 'GnMQrDhvWVELA9U6O9wipTP0v10Nkp5aotDDfLm38DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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