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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2992ef21fa3e1f91d82d5cdb63bec5081415a717c6c7da1d5c5cecf6712692' 
  AND token = 'hAy2p0OBi1XAa5wN4srY+GKYla1jmyXBZkyaNwWd0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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