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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ee421cf8bb9292f697f0276d84f7ce8a5a886d630bd4008f8a0d2565516237' 
  AND token = '5bp5uvWTfAEWjb7Qoa2qtEbRDS2aA1QW1juGNvHK+B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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