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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dd9cdf8a43bbb2709a3f8aa92b93ca2662339be8ff383a55443f7f6c31bedc' 
  AND token = '8dMIoE3NMVG6r47Tw4SzUh6n6rwb32GFMI8GLsO1HtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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