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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24efb7ec616b39104ea90dd4e68e47953ffa47b293bc69b6607428eb1f70bd20' 
  AND token = 'SpekSkpfAwsfD0QqeQAFoLGKLI9ZGMgtM2i7+4oG8YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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