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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ccc342ab2a0d3fdf56c6208418650db54de58398d7b2fb9e5963979866b5c0' 
  AND token = '+FmRY3as1X0tTgYIZwNS+CB9NV3Bbl2qmABcrbafDMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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