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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec9539e36bb69f7c49a24cd3625470bfd8907ae9b4ee89ff25011b3d9b6ba97' 
  AND token = 'c7K72bV0I4VUIvhMhMKrZ20IDaOUPbaxAan0Y3kWK/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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