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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f823242bf0dafc8e45fcc548f7a21d0b53874522a3a661c582d45fd451ea41b1' 
  AND token = 'YG0jdA8IWGr7fDFb3y6f1z7qt2j3S1PNrItg5Khpc74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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