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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca0dcc1645176566439444580efc7921192d8a551f825d6571948fe4b2f1e08' 
  AND token = '0fc/rXTAtRnnOoUwpJR8n4Dd0xwTkGYyRb/LxgqVJXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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