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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40aa1f784c0423c15150906064194d3bb5317677699c8d2169a562e838b44ccd' 
  AND token = 'rvTetYCEDei/XHAmRvREM7MkAj767CcdpNojLoGS6ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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