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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec04bf776f7a906290813c6c5ada3821c7fbadd61fa3dd746a24c269eebafa0' 
  AND token = 'PvAeM8MGithpfk9hOVfWoQ9Av2cVWM94ZjgsRQzyP3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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