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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0fd5e36f425a4e95f88a208fabb89a67881313508f4c2faf31f63eafd55d5d' 
  AND token = 'kEqhOt16Cz4oLum8CUJh1Swei9xa0W/48cO6sosumtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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