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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef96a730e2cb9cb2388c2d6e3ce30adc48bd3557077b7fbd2c9573773b6cef00' 
  AND token = 'kAoGdlnPcv1GdyD2LguYlkW3UAgyu3oGk2yqc67YIPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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