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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95683e942c180203851b39d686eed16f4994032d5ee76fd6db665d3f9bd15769' 
  AND token = 'jo1jYIDDj9Hh9QC7piD6xdB6lTB27h5SFRx/cYpCkGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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