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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a41e5d81bdbf074760a967d399030fea1344e8589633d693c9de50e0b3eb57' 
  AND token = 'MF8HEhijNNyX2yksuQdLBuQfEulLY0wPHS8a5cPEm/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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