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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf2b5fd03c39696c3521d8cf23a2c6e9a5c3b6cfc2846cab443a88587b47e98' 
  AND token = 'a+irRbe8mMKewRd46+W8KF8xt5D7AoKligaqFFGRbQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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