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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82d9fb2b16c496709bbe9f137210255cddd08a848dfe1f5656e75c5e3d315a3' 
  AND token = 'hQFLBJrrDsVOp56DdBFpCz5eOvVdJBETbE1O4BTrVZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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