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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6628a84aa1d019dee04d103c168d3e0d6bdd505a8a3986b4ca6ca01a5e339aa0' 
  AND token = 'nNKe4Saa5lgTfzr+d1ltfRwHBtG7sJguxLNdrKES1eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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