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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193f17676f37dc2298334a76ad10ce816a0d498103fa2169c3b76016221491f2' 
  AND token = 'yeQgqFu44xf3M2l8kZtGY9lGaF1HqRwe66K4wFd3D+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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