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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94299670001504a47bc805207b15ed159dc5d8c5f0c1aa0ee5addf4a7a147e43' 
  AND token = 'Yx1QsTR9yMTVYAQjN5lfyC1NrKgYOxH2TWPIV/ADRj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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