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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23882048db04c0cc70bb0eb950fc01e33281683eab135d76baa8c9117e84dc9' 
  AND token = 'z5YUSfjX2QR+I6Eeq7fQyJftdkyoE4SBGdC5CBokZhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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