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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2971c3c2e60cec7ce4c426ace930338094c0a24b900190ac85e402a136dc552' 
  AND token = '8vFxIncdbzaPEunVhNpIfXL56Y0ALa9/t8ozdqZT6f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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