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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316ab0b6832260294a0ac0cdf0817b55dd06a5df59e97413ed8d6d5d905cab30' 
  AND token = 'HipRnu2pvUfRZGU05fFzqHTfjMGJtn4w/Oq4nCh730o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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