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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a71c6687ddcc4c68ebfbfcd90533a6f0d949fbbc3cb01740a40b3b20a313126' 
  AND token = 'LFk9VimpHAVOSAdL36NjRM+6jlfdjBX65RCoDOWsZE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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