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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e443de0601c7abf9b0c805975b5389350949c55e5b8179cea6afea375147323' 
  AND token = 'iDORL8VZu7wc90QIUTNw/4IzieG1ztQ0zV/C8x8OH3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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