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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f1e22ec0ac194dfede1aa00046c7118e6e8e6e158d5dba8f67034436c79335' 
  AND token = 'Q23KItgjCskI4OV6kfeJ978mx/MucCtvyMR65Cm5yrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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