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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13bdfb0fb5c2d1b7c236d1e6067f39653978f4dfe48cd3bd75a6bc3298b52bc' 
  AND token = 'RJkCFngSvmqgOCU8Hxrw68sXLPIN74TDUXhoCSC59y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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