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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c877a262d687a87a72540c9a7049e2e1a467a819dec8fef6bd5ddf1806271861' 
  AND token = 'R5dIOS8orWvPAJfyglw94dOrS7SgC0xS+ChH818PCS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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