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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff93ce93daf2ab02c0735416175a14a24cc1c16b5056f83b75c696529e17b4c7' 
  AND token = 'N/Syfsi4LY1nc+oJUjTVCqtVEOdNDL6FT4bPPuHVtQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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