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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46f24ad6f43a6b35fe85d90bc5bba7c263ae87447dfae1b85c50065b791bedb' 
  AND token = 'Jl9S/s+DKnilzkbPmLFzFlMAkZSIhUddkjm08IiJFys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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