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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c79ca02ea0aec4bd5fd3099663e49f246a953a0b54ffdf6206ed9e434ea6a7' 
  AND token = 'LvU+AhwZFEQJbMV5vJpoy6A6x/+jQEWbidr5OtmJFc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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