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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a2a6692684780f9bb79b6c1ea7b5d26da1bf7af740e094dfed58f53eac47c4' 
  AND token = 'JQR4diAICNhMzCGWVYWZlSl6d1QlS+boFVmVQb54uEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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