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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6b4c6d0b9a5693a906131c9631a56542e9b871ef061c9d22a2d93e2f29ae41' 
  AND token = '1/xye4MnGpeYwkcQ/sg3sSmH4uFlgfLrpRQcqk8YUbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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